Slow relaxation processes in nematic liquid crystals at weak surface anchoring

被引:26
作者
Pasechnik, S. V.
Chigrinov, V. G.
Shmeliova, D. V.
Tsvetkov, V. A.
Kremenetsky, V. N.
Liu Zhijian
Dubtsov, A. V.
机构
[1] Moscow State Acad Instrument Engn & Comp Sci, Moscow 107846, Russia
[2] Hong Kong Univ Sci & Technol, Kowloon, Hong Kong, Peoples R China
关键词
D O I
10.1080/02678290500277862
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We present new results of experimental investigations of azimuthal director reorientation dynamics for a nematic liquid crystal on solid substrates. Two types of substrate with weak anchoring were studied: glass/polystyrene and glass/UV-activated dye. Slow and fast relaxation processes were observed in both cases under the action of a strong 'in-plane' electric field. The slow surface reorientation and memory effects were controlled by two parameters: the electric voltage and the excitation time. It was established that the increase of the excitation time results in a slowing of the relaxation of the system to the initial state after turning off the electric field. A phenomenological model of a gliding of easy axes is proposed to explain the slow relaxation process.
引用
收藏
页码:175 / 185
页数:11
相关论文
共 13 条
[1]  
[Anonymous], LIQUID CRYSTAL DEVIC
[2]   Diffusion model of photoaligning in azo-dye layers [J].
Chigrinov, Vladimir ;
Pikin, Sergey ;
Verevochnikov, Andrey ;
Kozenkov, Vladimir ;
Khazimullin, Maxim ;
Ho, Jacob ;
Huang, Dan Ding ;
Kwok, Hoi-Sing .
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2004, 69 (6 1) :061713-1
[3]   ORDERING AND SELF-DIFFUSION IN THE 1ST MOLECULAR LAYER AT A LIQUID-CRYSTAL POLYMER INTERFACE [J].
CRAWFORD, GP ;
YANG, DK ;
ZUMER, S ;
FINOTELLO, D ;
DOANE, JW .
PHYSICAL REVIEW LETTERS, 1991, 66 (06) :723-726
[4]   LIQUID-CRYSTALLINE STATE OF THE WALL-ADJACENT LAYERS OF SOME POLAR LIQUIDS [J].
DERJAGUIN, BV ;
POPOVSKIJ, YM ;
ALTOIZ, BA .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1983, 96 (02) :492-503
[5]   Hydrodynamic model for surface nematic viscosity [J].
Durand, GE ;
Virga, EG .
PHYSICAL REVIEW E, 1999, 59 (04) :4137-4142
[6]   Surface reorientation dynamics of nematic liquid crystals [J].
Faetti, S ;
Nobili, M ;
Raggi, I .
EUROPEAN PHYSICAL JOURNAL B, 1999, 11 (03) :445-453
[7]  
Jánossy I, 2004, PHYS REV E, V70, DOI 10.1103/PhysRevE.70.052701
[8]   Zenithal gliding of the easy axis of a nematic liquid crystal [J].
Joly, Stéphane ;
Antonova, Krassimira ;
Martinot-Lagarde, Philippe ;
Dozov, Ivan .
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2004, 70 (5 1) :050701-1
[9]   Surface dynamics of liquids in nanopores [J].
Korb, JP ;
Malier, L ;
Cros, F ;
Xu, S ;
Jonas, J .
PHYSICAL REVIEW LETTERS, 1996, 77 (11) :2312-2315
[10]   Anisotropic shear viscosity in nematic liquid crystals: new optical measurement method [J].
Pasechnik, SV ;
Chigrinov, VG ;
Shmeliova, DV ;
Tsvetkov, VA ;
Voronov, AN .
LIQUID CRYSTALS, 2004, 31 (04) :585-592